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Silver Bromide (AgBr) Optical Material

Silver bromide is a non-glass, inorganic optical material. It has a fairly high density among non-glass optical ceramics. In addition, it has a fairly low melting temperature and a moderately low thermal conductivity. The graph bars on the material properties cards below compare silver bromide to other non-glass optical ceramics (top) and the entire database (bottom).

Thermal Properties

Melting Onset (Solidus)

430 °C 810 °F

Specific Heat Capacity

290 J/kg-K 0.069 BTU/lb-°F

Thermal Conductivity

1.2 W/m-K 0.69 BTU/h-ft-°F

Thermal Expansion

30 µm/m-K

Other Material Properties

Density

6.5 g/cm3 400 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz

13

Elastic (Young's, Tensile) Modulus

32 GPa 4.6 x 106 psi

Light Transmission Range

0.45 to 35 µm

Refractive Index

2.3

Common Calculations

Stiffness to Weight: Axial

2.7 points

Stiffness to Weight: Bending

16 points

Thermal Diffusivity

0.64 m2/s

Followup Questions

Further Reading

Handbook of Optical Materials, Marvin J. Weber, 2003

Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998